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Airspace Classifications

The world's navigable airspace is divided into three-dimensional segments, each of which is assigned to a specific class. The U.S. and most nations adhere to International Civil Aviation Organization (ICAO) classifications. Individual nations also designate Special Use Airspace, which establishes additional air navigation rules for national security or safety. The U.S. airspace classification scheme is designed to provide maximum pilot flexibility with acceptable levels of risk appropriate to the type of operation and traffic density within that class of airspace - in particular to provide separation and active control in areas of dense or high-speed flight operations.

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